package util;

import com.mysql.jdbc.jdbc2.optional.MysqlDataSource;

import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;

public class DBUtils {
    private static volatile MysqlDataSource mysqlDataSource;

    private static MysqlDataSource getMysqlDataSource() {
        if(mysqlDataSource == null) {
            synchronized (DBUtils.class) {
                if(mysqlDataSource == null) {
                    mysqlDataSource = new MysqlDataSource();
                    mysqlDataSource.setURL("jdbc:mysql://127.0.0.1:3306/myblog2022?characterEncoding=utf8&useSSL=false");
                    mysqlDataSource.setUser("root");
                    mysqlDataSource.setPassword("12345678");
                }
            }
        }
        return mysqlDataSource;
    }

    public static Connection getConnection() throws SQLException {
        return getMysqlDataSource().getConnection();
    }


//    public static Connection getConnection() throws SQLException {
//        Connection connection = getMysqlDataSource().getConnection();
//        return connection;
//    }

    public static void close(ResultSet resultSet, PreparedStatement statement, Connection connection) throws SQLException {
        if(resultSet != null) {
            resultSet.close();
        }
        if(statement != null) {
            statement.close();
        }
        if(connection != null) {
            connection.close();
        }
    }
}
